utils/log: support max days of keeping log files

src/frp/models/client/config.go

@@ -28,6 +28,7 @@ var (
 	LogFile           string = "console"
 	LogWay            string = "console"
 	LogLevel          string = "info"
+	LogMaxDays        int64  = 3
 	HeartBeatInterval int64  = 20
 	HeartBeatTimeout  int64  = 90
 )
@@ -69,6 +70,11 @@ func LoadConf(confFile string) (err error) {
 		LogLevel = tmpStr
 	}
 
+	tmpStr, ok = conf.Get("common", "log_max_days")
+	if ok {
+		LogMaxDays, _ = strconv.ParseInt(tmpStr, 10, 64)
+	}
+
 	var authToken string
 	tmpStr, ok = conf.Get("common", "auth_token")
 	if ok {

src/frp/models/server/config.go

@@ -32,6 +32,7 @@ var (
 	LogFile          string = "console"
 	LogWay           string = "console" // console or file
 	LogLevel         string = "info"
+	LogMaxDays       int64  = 3
 	HeartBeatTimeout int64  = 90
 	UserConnTimeout  int64  = 10
 
@@ -82,6 +83,11 @@ func LoadConf(confFile string) (err error) {
 		LogLevel = tmpStr
 	}
 
+	tmpStr, ok = conf.Get("common", "log_max_days")
+	if ok {
+		LogMaxDays, _ = strconv.ParseInt(tmpStr, 10, 64)
+	}
+
 	// servers
 	for name, section := range conf {
 		if name != "common" {

src/frp/models/server/server.go

@@ -113,8 +113,8 @@ func (p *ProxyServer) Start() (err error) {
 				// set timeout
 				time.AfterFunc(time.Duration(UserConnTimeout)*time.Second, func() {
 					p.Lock()
-					defer p.Unlock()
 					element := p.userConnList.Front()
+					p.Unlock()
 					if element == nil {
 						return
 					}